en ارتوپدي Orthopedic پژوهشي Research <div style="text-align: justify;"><span style="font-size:11pt"><span style="line-height:normal"><span sans-serif="" style="font-family:Calibri,"><b><span style="font-size:10.0pt"><span new="" roman="" style="font-family:" times="">Background & Objectives: </span></span></b><span style="font-size:10.0pt"><span new="" roman="" style="font-family:" times="">EOS, as a new&lrm; imaging technique, has several benefits over conventional radiography in measuring spinal curvatures. In this study, we aimed to use EOS to determine the normal values of thoracic kyphosis besides its association with the participants&#39; age and gender.</span></span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:normal"><span sans-serif="" style="font-family:Calibri,"><b><span style="font-size:10.0pt"><span new="" roman="" style="font-family:" times="">Materials & Methods:</span></span></b><span style="font-size:10.0pt"><span new="" roman="" style="font-family:" times=""> In this retrospective cross-sectional study, 100 individuals with no history of spinal abnormality were included. Spinal curvatures, comprising proximal thoracic segment, distal thoracic segment, and total thoracic kyphosis, were measured on EOS images using a Cob method. The demographic characteristics of the participants, such as age and gender were also extracted from medical profiles.</span></span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:normal"><span sans-serif="" style="font-family:Calibri,"><b><span style="font-size:10.0pt"><span new="" roman="" style="font-family:" times="">Results:</span></span></b><span style="font-size:10.0pt"><span new="" roman="" style="font-family:" times=""> The study population included 31 males and 69 females with a mean age of 27.2 &plusmn; 17.4 years (range 6-66). The mean curvatures of proximal and distal thoracic segments were 14.5 &plusmn; 6.5&ordm; and 32.7 &plusmn; 7.5&ordm;, respectively. The mean total thoracic kyphosis was 47.2 &plusmn; 7.2&ordm;. Besides, <a name="_Hlk116516918">distal and total thoracic kyphosis</a>, but not proximal thoracic segment, were significantly more in participants aged over 40 years (p=0.03, p=0.04, and p=0.07, respectively). No significant association was found between the thoracic curvatures and participants&#39; sex.</span></span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:normal"><span sans-serif="" style="font-family:Calibri,"><b><span style="font-size:10.0pt"><span new="" roman="" style="font-family:" times="">Conclusion:</span></span></b><span style="font-size:10.0pt"><span new="" roman="" style="font-family:" times=""> It seems that there is a direct relationship between distal and total thoracic kyphosis and aging; <a name="_Hlk117304975">however, more studies are required in order to approve our results. </a></span></span></span></span></span></div> <span style="font-size:11pt"><span style="line-height:normal"><span sans-serif="" style="font-family:Calibri,"><span style="font-size:10.0pt"><span style="font-family:"Times New Roman","serif""></span></span></span></span></span><br> &nbsp; Spinal curvature, thoracic kyphosis, EOS 23 28 http://jabs.fums.ac.ir/browse.php?a_code=A-10-3208-1&slc_lang=en&sid=1 Hasan Ghandehari حسن قندهاری H.Ghandehari@yahoo.com 100319475328460027678 100319475328460027678 No Department of Orthopedics, Iran University of Medical Sciences, Tehran, Iran گروه ارتوپدی، دانشگاه علوم پزشکی ایران، تهران، ایران Samaneh Tanhapour سمانه تنهاپور S.Tanhapour@yahoo.com 100319475328460027679 100319475328460027679 No Student Research Committee, Iran University of Medical Sciences, Tehran, Iran کمیته تحقیقات دانشجویی، دانشگاه علوم پزشکی ایران، تهران، ایران Mohammad Hassanzadeh محمد حسن زاده M.Hassanzadeh@yahoo.com 100319475328460027680 100319475328460027680 No Bone and Joint Reconstruction Research Center, Department of Orthopedics, School of Medicine, Iran University of Medical Sciences, Tehran, Iran مرکز تحقیقات بازسازی استخوان و مفاصل، گروه ارتوپدی، دانشکده پزشکی، دانشگاه علوم پزشکی ایران، تهران، ایران Pooria Rooyan پوریا رویان Refatalash@gmail.com 100319475328460027681 100319475328460027681 Yes Department of Orthopedics, Iran University of Medical Sciences, Tehran, Iran گروه ارتوپدی، دانشگاه علوم پزشکی ایران، تهران، ایران